CONCRETE
PIPE, SPECIAL PIPE SECTIONS & RELATED PRECAST UNITS

Concrete
pipe and related precast units shall conform to the applicable requirements of
AASHTO M86, M170, M206 or M207 for the strength (class) and size specified and
the additional requirements as set forth in Section 4145, Section 4149, Section
2419, and other sections of the Standard Specifications of the Iowa Department
of Transportation. Each project shall include the same wall thickness for each
pipe size. Acceptance of standard strength 1500D through 3750D (class II
through class V) concrete pipe, special sections and related precast units will
be on the basis of certification for each strength (class) and size from
approved producers subject to periodic plant inspections and testing of monitor
samples. Producers approved to furnish pipe, special sections and related
precast units on the basis of certification are listed in Appendix A and
Appendix B of IM 445.01. Monitor inspection and testing will be performed by
the Iowa Department of Transportation.

The
connectors near the top of the pipe sections and all other fasteners shall be
coated using electroplating in accordance with ASTM B633, service condition
SC4, required coating thickness of 0.5 mil. Classification and coating suffix
FE / ZN 12. The connectors shall meet the requirements of ASTM A36 steel. All
joints shall be watertight (when specified) and shall be wrapped with
engineering fabric (when specified), from an approved source listed in IM
496.01 Appendix B. Rubber gaskets for sealing the joints (when specified)
shall meet the requirements of ASTM C443.

IDENTIFICATION

In
addition to the marking requirements of Section 4145 of the Standard
Specifications, a Quality Control Technician shall legibly mark the word
“certified” on each unit. Each unit of pipe, including special sections so
marked and stamped, identifies the pipe as being in compliance with the
applicable AASHTO or ASTM Specifications, and the Iowa Department of
Transportation Standard Specifications. NOTE: 18” pipe or smaller
may be identified only on the outside surface. All other sizes shall be
identified both on the outside and inside surfaces.

All
pipes shall have the following markings: strength or class, date manufactured,
size, and trademark. Waterproof paint or ink shall be required. The District
Materials Engineer shall approve any other methods.

WET
CAST

A.Air content (when concrete
requires air entraining)-one test per week of production

B.Concrete strength-6 cylinders per
mix, per week

C.Test at 7 days (3 cylinders) and
at 28 days (3 cylinders)

D.Compressive strength requirements:

1.1500D (Class II) Reinforced
Concrete Pipe

12-inch to 72-inch diameter pipe, 4000 psi

78-inch to 144-inch diameter pipe, 5000 psi

2.For 2000D (Class III) Reinforced
Concrete Pipe

12-inch to 72-inch diameter pipe, 4000 psi

78-inch to 144-inch diameter pipe, 5000 psi

3.3000D (Class IV) Reinforced
Concrete Pipe

12-inch to 144-inch diameter Pipe, 5000 psi

4.3750D (Class V) Reinforced
Concrete Pipe

12-inch to 144-inch diameter pipe, 6000 psi

E.Minimum strength requirements for
all related precast units shall be as follows:

28-day strength: 4000 psi

Shipping strength: 3500 psi

Moving Strength: 1500 psi

DRY CAST

Concrete
Pipe Absorption Test - two tests per calendar year

THREE-EDGE BEARING TEST

The
minimum testing rate required shall be two pipes per size, per strength (class),
per year. The District Materials Engineer (DME) shall be notified prior to
testing or a schedule may be mutually agreed upon.

All
pipe and related precast items suitable for certification shall be stamped
“certified” prior to or at the time of stockpiling. Certified pipe that no
longer meets specifications (rejected) shall have the certification
identification obliterated.

The
producer shall afford the State of Iowa the opportunity for inspection, and
notify the District Materials Engineer of the intended production schedule.

The
producer shall test concrete pipes in accordance with the requirements of
AASHTO T280 or ASTM C497. Tests results shall comply with the strength and
absorption requirements contained therein. District Materials Engineers may
observe and monitor the testing and determine the testing frequency. The
producer shall supply a copy of all test results and a copy of the report of
each annual inspection trip to the Office of Materials and the District
Materials Engineer.

GENERAL
REQUIREMENTS

A.Winter concrete placement requires
the approval of the DME, based on the following:

REPAIRS

Pipes
and related precast units may be repaired due to imperfections in manufacturing
or minor damage during handling if the repaired pipe and related units are acceptable
to the DME and if the repair conforms to the requirements of the
specifications.

REJECTION

Pipes
and related precast units shall be subject to rejection upon the following
conditions:

A.Pipes/units are not being
inspected and/or certified

B.Pipes/units fail to conform to any
of the specification requirements

C.Poor workmanship and imperfections

CERTIFICATION DOCUMENTS

The
producer of certified concrete pipe, special sections, or other precast units
shall furnish, on each shipment day, a certified bill of materials or invoice
which identifies the county, project number, contractor, and number of pieces
of each class, size, and length and the plant the precast unit was fabricated.
The certification of compliance shall be signed by a designated, responsible
company representative and shall be stated as follows:

"The
materials itemized in this shipment are certified to be in compliance with
the applicable AASHTO and/or ASTM requirements and Iowa Department of
Transportation Standard Plans and Specifications, IMs and meet the Buy
America requirements as described in IM 107 for all steel, iron products and
coatings."

Authorized
Signature & Date

One
copy of the above-described document shall be forwarded to the Project Engineer
on the day the item is delivered to the project. In addition, one copy shall be
sent to the District Materials Engineer

The
fabricator shall also provide summary quantity documentation, as shown in Appendix
B of IM 445 to the District Materials Office responsible for the project and
the project engineer at the completion of the shipments to the project. A
designated representative shall sign the certification statement on the summary
documentation.